Evaluation of stable retentive properties of overdenture attachments.
Evaluation of stable retentive properties of overdenture attachments.
复制标题
覆盖义齿附着体稳定固位性能的评估。
作者：
V. Rutkūnas;H. Mizutani;Hidekazu Takahashi
目标
通过测量最大固位力，评价螺柱（ERA覆盖义齿（橙子和白色）、牙根（粉色）和OP锚#4）和磁性（Magfit EX 600 W）附着体的疲劳。比较覆盖义齿附着体固位稳定后的固位力。确定达到稳定保留所需的最小循环次数。
材料和方法
每种类型的附件使用三个样本。微型材料试验机（MMT-250NB-10，Shimadzu Co.，Tokyo，Japan）与传感器接口PCD-320和软件包PCD-30A（Kyowa Electronic Instruments Co.，Tokyo，Japan）以50 mm/min十字头速度进行2000次插入-移除循环。最初和每40次循环后测量最大固位力。
统计分析
配对t检验、单因素方差分析和Scheffe事后检验（P <0.05）。
结果
5种附着体在疲劳模拟前后的疲劳强度差异有统计学意义。除OP外，所有附件的固位力均下降。疲劳后，LRP的固位力最强。磁性附着体保留了基线时测量的最大固位量（98%）。EO和EW附着体分别仅保留了25%和37%的初始固位力。
结论
由于疲劳，覆盖义齿附着体逐渐失去固位力。螺柱附件比磁铁更容易疲劳。需要800次循环才能使覆盖义齿附着体保持相对稳定。
OBJECTIVES
To evaluate fatigue of stud (ERA Overdenture (orange and white), Locator Root (pink) and OP anchor # 4) and magnetic (Magfit EX600W) attachments by measuring maximum retentive force. To compare retentive force of overdenture attachments after their reach stable retention. To determine minimum number of cycles required to reach stable retention.
MATERIAL AND METHODS
Three specimens of each type of attachment were used. Micromaterial testing machine (MMT-250NB-10, Shimadzu Co., Tokyo, Japan) with a sensor interface PCD-320 and software package PCD-30A (Kyowa Electronic Instruments Co., Tokyo, Japan) was used to performe 2000 insertion-removal cycles with 50 mm/min cross head speed. Maximum retentive force was measured initially and after each 40 cycles.
STATISTICAL ANALYSIS
paired-samples t-test, one-way ANOVA and Scheffe post-hoc tests (P<0.05).
RESULTS
Before and after fatigue simulation statistically significant differences existed among the five types of attachments. Decrease of retention was characteristic for all attachments except OP. After fatigue LRP was most retentive. Magnetic attachments preserved maximum amount of retention measured at the baseline (98%). EO and EW attachments have preserved only 25% and 37% of initial retention respectively.
CONCLUSIONS
Due to fatigue overdenture attachments gradually loose their retention. Stud attachments are more susceptible to fatigue than magnets. Eight hundred cycles are required to achieve relatively stable retention of overdenture attachments.
临床牙科中的新磁性应用（Minoru Ai、Uuh-Yuan Shiau）
DOI：
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发表时间：
2004
期刊：
Biological Effects of Magnetic Attachment on the Human Body and Tissue (Quintessence books)
影响因子：
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作者：
Tetsuo Ichikawa;Naeko Kawamoto
通讯作者：
Naeko Kawamoto